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Just below the rock. It moves across rock and gravel. I have only seen it twice, both times at night after the lights have been off a couple of hours. Thanks.

Thought I would get others opinions before I cut a hole in my 20 gallon tank. I want to split the line from the overflow to send some of the water to the refugium and some to the sump. Would it be too hard to regulate it? Overflow 3'10" above the sump. Any help or suggestions would be...